I believe if you want anything to work it is important to invest a lot of time! You must be careful when investing money online however. Many scams will ask you to pay to join, and they will yield nothing in return to you, regardless of what they had advertised.
Some more information would be helpful. The money you must invest, is it simply on the products you plan on selling? or is it in joining a community, posting, or anything else? If its simply spent on designing or creating the product then I would say its not at a loss. As you can easily re-post at other websites to get your products seen/sold. If its post cost, as long as the "time it will be posted for" and the "price to post" is not to far out of balance it would be my opinion to try it for at least a few months. Losing 150USD or so to see if something will work, that you truly work hard at isn't much money at all.
Last piece of advice. When producing your products at home, start out with a limited number. Three to Five of each of the products you plan on posting. The reason for this is if it doesn't sale you won't have a storage room full of stock you are trying to get rid of, but if it is popular and within the first few weeks 100units, 1,000units, or 50,000units sell! haha then at least you can send out a few before you hire others for your production line!
Last but not least. If nothing sells, think of giving the items out as gifts. :) Xmas / Birthdays / Father/Mother's Day What ever it may be people love to receive hand made items!